Washington Navy Yard on lockdown Thursday morning

Washington D.C.'s Navy Yard facility is under lockdown Thursday morning, according to a Tweet from the U.S. Navy. This is the site of a 2013 shooting where 12 people were killed.

So far, officials haven't found any evidence of a shooting, a law enforcement source told CNN.

Police are searching building 197 on Thursday morning, the same building where the 2013 Navy Yard shooting took place, a source with DC's Metropolitan Police Department tells CNN. Police have cleared part of that building, according to the same law enforcement source.

The source said the original 911 call reported a shooting on the second floor. The source confirmed that the Metropolitan Police and multiple law enforcement agencies are checking for a person with a gun in the building.

The U.S. Navy says the facility is under a shelter-in-place order.

Navy Commander Scott Williams, who was at the Navy Yard on Thursday morning and during the attack two years ago, told CNN's "New Day" that the scene unfolding around the complex was "pretty much a mirror image of 2013".

In a preventative measure, officials closed Pennsylvania Avenue in front of the White House. A law enforcement official says the move is a standard security precaution in light of potential navy yard incident under investigation

Dozens of police and ambulance vehicles surrounded the Washington Navy Yard on Thursday morning. Bystanders tweeted photos of the scene, though official details on the incident we're scarce as of Thursday morning.

Credit: CNN